C H A P T E R

6

Data Input

 

Figure 6-19

Scrubbing a little or a lot

 

 

A whole shape

A single word

A group of words

Part of a shape

 

 

 

Selected text and

A single letter

shapes (start

scrubbing outside

(scrub over the

the selection to

letter at least four

avoid moving it)

times)

 

The effect of scrubbing may be different if a user first selects several objects. If a user selects several objects, contiguous or not, and then scrubs over all or any part of the selected objects, all the selected objects are deleted. Unselected objects, if any, are not deleted by this scrub. However, if nothing is selected, all objects touched by the scrubbing gesture are deleted.

Your application doesn’t have to do anything to handle scrubbing in input areas that are based on Newton prototypes. If you make other input areas, you must program them to recognize the scrubbing gesture, play the poof sound, and display the dissipating smoke animation sequence. Scale the smoke cloud to the size of the user’s zigzag gesture, keeping the height and width proportional to the original image’s dimensions. Do not scale the smoke cloud down so much that it becomes unrecognizable, even if the zigzag gesture is very small.

Writing, Drawing, and Editing

6-25

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Image 193
Apple 2 manual Data Input Scrubbing a little or a lot

2 specifications

The Apple II is a defining product in the history of personal computing, first introduced in 1977 by Apple Computer, Inc. Designed by Steve Wozniak, the Apple II was one of the first highly successful mass-produced microcomputer products and played a significant role in bringing personal computers into homes and schools.

One of the Apple II's standout features was its color graphics capability. It was one of the first personal computers to provide color output, thanks to its built-in video interface. The initial model supported a resolution of 280x192 pixels with a palette of 6 colors, which allowed for vibrant visuals that set it apart from contemporaries like the monochrome Altair 8800.

The Apple II was notable for its open architecture. This design allowed users to expand the computer's capabilities easily through a series of expansion slots. Users could add floppy disk drives, additional memory, and various peripheral devices, making the system highly adaptable to individual needs. This encouraged a thriving ecosystem of third-party hardware and software, which contributed to its popularity.

Another significant feature was its use of the 6502 microprocessor. This 8-bit CPU was not only affordable but also powerful for its time, allowing the Apple II to run various applications efficiently. Along with a built-in keyboard and an innovative plastic case that housed its components, the design was user-friendly and appealing.

The Apple II also introduced the concept of “bootable software” through the use of floppy disks. The disk operating system (DOS) allowed users to store and run multiple programs without having to reload software manually, providing a level of convenience that had not been widely available before. Key software like VisiCalc, the first spreadsheet program, helped boost sales, showcasing the Apple II's utility in business and education environments.

The computer was also well-known for its early adoption of BASIC programming language. Apple provided an operating system that supported Applesoft BASIC, which enabled users, including students, to write their programs, further fostering a community of developers.

In summary, the Apple II's color graphics, open architecture, powerful 6502 processor, innovative use of floppy disks, and support for BASIC programming made it a revolutionary product in its time. Its legacy laid the groundwork for future personal computers and established Apple as a leader in the burgeoning tech industry. The Apple II remains an iconic symbol of the early personal computing era, reflecting a generation's transition into a digitally connected world.